What element has 4 valence electrons and 3 orbital shells

Which of the following elements would you expect to have the lowest ionization energy value? fluorine, lithium, neon, nitrogen

What is the maximum number of electrons that an atomic orbital can contain?

Achemistry student weighs out 0.306 g of citric acid (h3c6h5o7), a triprotic acid, into a 250 ml volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with 0.1000 m naoh solution. calculate the volume of naoh solution the student will need to add to reach the final equivalence point. be sure your answer has the correct number of significant digits.